Fix Unreal Blackholio Tutorial for project rename (#4044)

# Description of Changes

Fixes a problem with renaming the project from client_unreal to
blackholio which causes the C++ header code to be incorrect

# API and ABI breaking changes

N/A

# Expected complexity level and risk

1 - Updates a small portion of the Unreal Tutorial documentation

# Testing

Testing the current docs is what found the issue.

- [x] Rebuilt the Unreal Blackholio from the tutorial

---------

Signed-off-by: Jason Larabie <jason@clockworklabs.io>
Co-authored-by: clockwork-labs-bot <clockwork-labs-bot@users.noreply.github.com>

Author: JasonAtClockwork

docs/docs/00100-intro/00300-tutorials/00400-unreal-tutorial/00300-part-2.md

@@ -716,7 +716,7 @@ Update `GameManager.h` as follows to set up the Unreal client connection to the
 class UDbConnection;
 
 UCLASS()
-class CLIENT_UNREAL_API AGameManager : public AActor
+class BLACKHOLIO_API AGameManager : public AActor
 {
     GENERATED_BODY()
 

docs/docs/00100-intro/00300-tutorials/00400-unreal-tutorial/00400-part-3.md

@@ -1318,7 +1318,7 @@ struct FEventContext;
 struct FEntityType;
 
 UCLASS()
-class CLIENT_UNREAL_API AEntity : public AActor
+class BLACKHOLIO_API AEntity : public AActor
 {
     GENERATED_BODY()
 
@@ -1433,7 +1433,7 @@ struct FCircleType;
 class APlayerPawn;
 
 UCLASS()
-class CLIENT_UNREAL_API ACircle : public AEntity
+class BLACKHOLIO_API ACircle : public AEntity
 {
     GENERATED_BODY()
 
@@ -1541,7 +1541,7 @@ Open `Food.h` and update it as follows:
 struct FFoodType;
 
 UCLASS()
-class CLIENT_UNREAL_API AFood : public AEntity
+class BLACKHOLIO_API AFood : public AEntity
 {
     GENERATED_BODY()
 
@@ -1600,7 +1600,7 @@ class ACircle;
 struct FPlayerType;
 
 UCLASS()
-class CLIENT_UNREAL_API APlayerPawn : public APawn
+class BLACKHOLIO_API APlayerPawn : public APawn
 {
     GENERATED_BODY()
 
@@ -1994,14 +1994,14 @@ class AFood;
 class APlayerPawn;
 
 UCLASS()
-class CLIENT_UNREAL_API AGameManager : public AActor
+class BLACKHOLIO_API AGameManager : public AActor
 // ...
 ```
 
 Add in public below the TokenFilePath:
 
 ```cpp
-class CLIENT_UNREAL_API AGameManager : public AActor
+class BLACKHOLIO_API AGameManager : public AActor
 {
     GENERATED_BODY()
 
@@ -2307,7 +2307,7 @@ Edit `BlackholioPlayerController.h` as follows:
 class APlayerPawn;
 
 UCLASS()
-class CLIENT_UNREAL_API ABlackholioPlayerController : public APlayerController
+class BLACKHOLIO_API ABlackholioPlayerController : public APlayerController
 {
     GENERATED_BODY()